HTTPfy

Port 1547 (laplink)

IANA assigns port 1547 to laplink.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
laplink TCP laplink Michael Crawford -
laplink UDP laplink Michael Crawford -

Check what is listening on port 1547

Linux: is anything listening on TCP 1547?
sudo ss -tlnp 'sport = :1547'
Linux: UDP 1547
sudo ss -ulnp 'sport = :1547'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1547
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1547 '
Windows (Command Prompt)
netstat -ano | findstr :1547
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1547 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1547
From Windows
Test-NetConnection HOST -Port 1547
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1547

Block port 1547 in the firewall

ufw
sudo ufw deny 1547/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1547 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1547 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1547' -Direction Inbound -Protocol TCP -LocalPort 1547 -Action Block
ufw
sudo ufw deny 1547/udp
iptables
sudo iptables -A INPUT -p udp --dport 1547 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1547 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1547' -Direction Inbound -Protocol UDP -LocalPort 1547 -Action Block

Related ports

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.